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Quik Stop No 121 Closure Report • CCI Project No 12118 Page 14 6 The KVA C-Sparge System operated a total of 9,569 hours until May 13, 2005 at which time the System was shut-down At that time all A-aquifer wells were reported to be free of detectable MTBE contamination B-aquifer well, MW-6, was reported to have 1 5 ug/L MTBE The County requested the System be shut-down to observe whether there would be any rebound of petroleum hydrocarbons in the groundwater over four quarters On April 18, 2006, after four additional quarters of groundwater monitoring, the Quik Stop site remained free of detectable petroleum hydrocarbons Based on all the data gathered to date, the soil and groundwater contamination at Quik Stop Market No 121 has been remediated to "non-detect" (ND) levels, therefore, there are no soil or groundwater conditions which could adversely impact water quality, human health or safety by either direct contact with the soil and groundwater or vapor migration The work performed at Quik Stop Market No 121 satisfies the following low-risk closure criteria established by the Regional Water Quality Control Board 1) The release and ongoing sources, including free product, have been removed or remediated, 2) The site has been adequately characterized, 3) The contamination is not migrating, 4) No water wells, deeper drinking water aquifers, surface water, or other sensitive receptors are likely to be impacted, 5) The site poses no significant risk to human health, 6) The site poses no significant risk to the environment Based on the findings discussed in this Closure Report, no further environmental work at the site is warranted, other than the removal of the existing groundwater monitoring and sparge wells from the site, in accordance with the protocol of San Joaquin County, Environmental Health Division requirements Quik Stop Market Inc respectfully requests case closure